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Based on her paper's results, local wildlife managers have decided to deworm camels in the study area to protect animals such as giraffes, whose numbers are declining.

In the end, many people felt more comfortable swallowing an unproven drug used to deworm horses or taking their chance with a deadly virus than getting a vaccine that had been shown to protect the vast majority of people against severe disease and death.

On Thursday, she complained that she could not get a doctor to prescribe her ivermectin, a drug used to treat parasites in humans and deworm livestock.

Now there is ivermectin, which is more commonly used to deworm horses and other large animals, but with a human-strength prescription for parasites and some skin conditions.

“It’s stressful to think about. What if I can’t deworm my horses?”